German luxury car brand Porsche has halted sales of custom-made new cars as it struggles to comply with new emissions regulations for petrol engines, Holger Appel writes in the Frankfurter Allgemeine Zeitung. The new WLTP emissions norm introduced by the European Union mean that a car’s individual features have to be taken into account when assessing its emissions output, Appel says. Germany’s Federal Motor Transport Authority (KBA) is said to be overwhelmed by licensing applications, meaning the carmaker cannot get the permits in time to satisfy customer demands, he writes. “It seems that some of those responsible have underestimated the enormous efforts that are needed here,” Appel says.